Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2015
Jan. 31, 2017
Sep. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Commitments And Contingencies [Line Items]                  
Operating lease rent expense             $ 954,000 $ 964,000  
Sub-lease income             67,000 100,000  
Assets acquired under capital leases             163,000    
Depreciation expense             208,000 179,000  
Capital Lease Assets                  
Commitments And Contingencies [Line Items]                  
Depreciation expense             38,000 31,000  
Additional Office Space                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net     $ 10,000       5,000    
Refundable security deposit             $ 3,000    
Lease commencement date     Oct. 01, 2017       May 01, 2014    
Lease expires     Nov. 30, 2024       Jul. 31, 2019    
Number of rent free periods             3 months    
Rent credit     $ 40,000,000            
Office Space | Charlottesville, VA.                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net             $ 2,000    
Refundable security deposit             $ 2,000    
Lease commencement date             Jun. 30, 2015    
Lease expires             Jun. 30, 2018    
Number of rent free periods             2 months    
Office Space | Bedminster, NJ.                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net             $ 11,000    
Lease expires             Mar. 31, 2022    
Number of rent free periods             4 months    
Office Space | Princeton, NJ.                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net       $ 6,000     $ 5,000    
Lease expires       Aug. 31, 2022     Apr. 30, 2016    
Number of rent free periods       5 months          
Office Space | New York City                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net             $ 446,000    
Lease commencement date             Oct. 01, 2017    
Lease expires             Sep. 30, 2028    
Number of rent free periods             12 months    
Payments for tenant improvements             $ 2,080,000    
Office Space | Livingston, NJ                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net       $ 2,000          
Office Equipment                  
Commitments And Contingencies [Line Items]                  
Capital lease obligation             $ 353,000   $ 267,000
Office Equipment | Telephone System                  
Commitments And Contingencies [Line Items]                  
Lease expires             Nov. 30, 2018    
Assets acquired under capital leases             $ 321,000    
Capital lease, period             5 years    
Capital lease, minimum monthly payment             $ 5,000    
Office Equipment | Copier                  
Commitments And Contingencies [Line Items]                  
Lease expires   Dec. 31, 2018     Oct. 31, 2018 Jun. 30, 2018      
Assets acquired under capital leases   $ 11,000     $ 18,000 $ 21,000      
Capital lease, period   2 years     3 years 3 years      
Capital lease, minimum monthly payment   $ 1,000     $ 1,000 $ 1,000      
Office Equipment | Two Copiers                  
Commitments And Contingencies [Line Items]                  
Lease expires   Jan. 31, 2022              
Assets acquired under capital leases   $ 152,000              
Capital lease, period   5 years              
Capital lease, minimum monthly payment   $ 3,000              
Office Equipment | Jamison                  
Commitments And Contingencies [Line Items]                  
Assets acquired under capital leases $ 253,000                
Letter of Credit                  
Commitments And Contingencies [Line Items]                  
Refundable security deposit             506,000   $ 506,000
Letter of Credit | Boston landlord                  
Commitments And Contingencies [Line Items]                  
Refundable security deposit             80,000    
General and administrative                  
Commitments And Contingencies [Line Items]                  
Operating lease rent expense, net             $ 887,000 $ 864,000